他的嘴巴是宽的用英语怎么说

"His mouth is wide" 可以用英语表示为 "His mouth is wide."

这句话的来源是描述一个人的嘴巴特征，wide 是形容词，表示宽。

例句:

"He has a wide smile." (他有一个宽笑容)
"The river was too wide to swim across." (这条河太宽了, 不能游过去)
"The box was too wide to fit through the door." (这个盒子太宽了, 不能从门里面穿过去)